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raytracer: add support for per-point pointsize #29474

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raytracer: add support for per-point pointsize #29474

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carli2
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@carli2 carli2 commented Sep 23, 2024

I created this patch to support pixel-perfect collision detection with individually sized points.

Here's an example vertex shader to use gl_Points with pointsize in world-coordinates:

      attribute float pointsize;
      uniform vec2 resolution;
      void main() {
         gl_Position = projectionMatrix * modelViewMatrix * vec4(position.x, position.y, position.z, 1.0);
         gl_PointSize = pointsize * resolution.y * projectionMatrix[1][1] / gl_Position.w;
      }

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github-actions bot commented Sep 23, 2024 •
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📦 Bundle size

Full ESM build, minified and gzipped.

Before After Diff
WebGL 687.32
170.19		 687.52
170.25		 +202 B
+55 B
WebGPU 836.34
224.18		 836.54
224.24		 +202 B
+55 B
WebGPU Nodes 835.85
224.06		 836.05
224.12		 +202 B
+59 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

Before After Diff
WebGL 463.24
111.86		 463.24
111.86		 +0 B
+0 B
WebGPU 532.75
143.69		 532.75
143.69		 +0 B
+0 B
WebGPU Nodes 489.1
133.44		 489.1
133.44		 +0 B
+0 B

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@carli2